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Umboi (also named Rooke or Siassi) is a volcanic island between the mainland of Papua New Guinea and the island of New Britain. It is separated from New Britain by the Dampier Strait and Huon Peninsula, and New Guinea by the Vitiaz Strait. It has an elevation of 1,335 metres (4,380 feet). Languages are Papuan ; and Austronesian: Mbula, Karanai, and .